<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片区域 -->
        <el-card>
            <el-alert
            center
            show-icon
            :closable="false"
            title="添加商品信息"
            type="info">
            </el-alert>
            <!-- 步骤条 -->
            <el-steps :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab栏 -->
            <el-form :model="addForm"
            label-position="top" 
            :rules="addFormRules" ref="addFormRef" 
            label-width="100px">
                <el-tabs :tab-position="'left'"
                :before-leave="beforeTabLeave"
                @tab-click="tabClicked"
                v-model="activeIndex">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                            v-model="addForm.goods_cat"
                            :options="catelist"
                            :props="cateProps"
                            @change="handleChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的Item项 -->
                        <el-form-item :label="item.attr_name" 
                        v-for="item in manyTableData" 
                        :key="item.attr_id" >
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="item1" 
                                v-for="(item1,i) in item.attr_vals" 
                                :key="i"
                                border size="mini" ></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name"
                         v-for="item in onlyTableData" 
                         :key="item.attr_id">
                           <el-input v-model="item.attr_vals">
                           </el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- 
                            action 上传图片的后台地址 
                            on-preview  处理图片预览效果
                            handleRemove  处理移除图片的操作

                            在本次操作中，添加图片是无效token所以需要进行重新添加请求头的token
                        -->
                        <el-upload
                        :action="uploadURL"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        :headers="headersObj"
                        :on-success="handleSuccess"
                        list-type="picture">
                        <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器 -->
                        <quill-editor v-model="addForm.goods_introduce">
                        </quill-editor>
                        <!-- 添加按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 商品图片预览 -->
        <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
           <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'
export default {
    data() {
        return {
            activeIndex: '0',
            // 添加表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat: [],
                // 上传图片的路径
                pics: [],
                // 产品介绍
                goods_introduce: '',
                // 商品参数
                attrs: []
            },
            // 表单的规则
            addFormRules: {
                goods_name: [
                    {
                       required: true,
                        message: '请输入商品名称', 
                        trigger: 'blur' 
                    }
                ],
                goods_price: [
                    {
                       required: true,
                        message: '请输入商品价格', 
                        trigger: 'blur' 
                    }
                ],
                goods_weight: [
                    {
                       required: true,
                        message: '请输入商品重量', 
                        trigger: 'blur' 
                    }
                ],
                goods_number: [
                    {
                       required: true,
                        message: '请输入商品数量', 
                        trigger: 'blur' 
                    }
                ],
                goods_cat: [
                    {
                       required: true,
                        message: '请选择商品分类', 
                        trigger: 'blur' 
                    }
                ]
            },
            // 获取商品分类
            catelist: [],
            // 级联选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                expandTrigger: 'hover' 
            },
            // 获取到的分类参数
            manyTableData: [],
            // 获取到分类的属性
            onlyTableData: [],
            // 上传图片的地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 设置请求头的token
            headersObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            // 预览你图片的地址
            previewPath: '',
            // 预览图片的显示与隐藏
            previewVisible: false
        }
    },
    created() {
        // 获取商品分类
        this.getCateList()
    },
    methods: {
        async getCateList() {
            const {data: res} = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.error("获取商品分类失败")
            }
            this.catelist = res.data
            console.log(res);
        },
        // 级联选中项器选中项变化，会触发这个函数
        handleChange() {
            console.log(this.addForm.goods_cat);
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
            }
        },
        // 切换tabs前进行判断
        beforeTabLeave(activeName,oldActiveName) {
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.info("请先选择商品分类")
                return false
            }
        },
        // 触发tab标签时，获取分类参数
        async tabClicked() {
            if(this.activeIndex === '1') {
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params: {sel: 'many'}
                })
                console.log(res);
                if(res.meta.status !== 200) {
                    return this.$message.error("获取分类参数失败")
                }
                res.data.forEach( item => {
                    item.attr_vals = item.attr_vals.length ===0 ? [] : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            }else if(this.activeIndex == '2') {
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params: {sel: 'only'}
                })
                console.log(res);
                if(res.meta.status !== 200) {
                    return this.$message.error("获取分类属性失败")
                }
                this.onlyTableData = res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file) {
            console.log(file);
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file) {
            // 1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2.从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            // 3.调用数组中，找到这个图片对应的索引值
            this.addForm.pics.splice(i,1)
        },
        // 图片上传成功调用的钩子函数
        handleSuccess(response) {
            // console.log(response);
            // 1.拼接得到一个图片信息对象
            const picInfo = {
                pic: response.data.tmp_path
            }
            // 2.将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm);
        },
        // 添加商品
        async add() {
            const confirmResult = await this.$refs.addFormRef.validate(valid => {
                if(!valid) return this.$message.error("请填写表单必要项")
            })

            // 执行添加的业务逻辑
            
            // 因为在级联选择器中goods_cat是数组，但是添加商品要是字符串，所以需要进行深拷贝之后再把他弄成字符串；如果直接弄成字符串会与级联选择器造成矛盾
            const form = _.cloneDeep(this.addForm)
            form.goods_cat = form.goods_cat.join(',')
            console.log(form);

            // 处理动态参数
            this.manyTableData.forEach(item => {
                const newInfo = {
                    attr_id: item.attr_id,
                    attr_value: item.attr_vals.join(' ')
                }
                this.addForm.attrs.push(newInfo)
            })

            // 处理静态函数
            this.onlyTableData.forEach(item => {
                const newInfo = {
                    attr_id: item.attr_id,
                    attr_value: item.attr_vals
                }
                this.addForm.attrs.push(newInfo)
            })
            form.attrs = this.addForm.attrs
            console.log(form);

            // 发起请求添加商品
            // 商品的名称，必须是唯一的
            const {data: res} = await this.$http.post('goods',form)
            if(res.meta.status !== 201) {
                return this.$message.error("添加失败")
            }
            this.$message.success("添加成功")
            this.$router.push('/goods')

        }
    },
    computed: {
        // 获取对应分类参数Id
        cateId() {
            if(this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        }
    },
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 10px 0 0 !important;
}
.previewImg {
    width: 100%;
}
.btnAdd {
    margin-top: 10px;
}
</style>